The purpose of this challenge is to give the environments of Castlevania a little love. While they do have a lot of that old school grid-like charm, there's lots of room for improvement! with a focus on design, eliminating the grid, and more organic feel, there are lessons to be learned here that can apply to modern pixel art, and even hi res 2D games.
Here is the NES palette, as well as a link to Kasumi's post on some of it's restrictions:http://pixelation.org/index.php?topic=10784.msg115062#msg115062
The most important restrictions being: 4 available 4 color palettes that all share one universal color (usually black), and that each 16x16 area must share the same palette. Keep in mind that the HUD needs a palette, so if you have 4 on screen, one of them needs to be shared with the hud!
However, as if things weren't hard enough with just those colors to choose from, we also have a tile limit due to how this game handled graphics, says the great Kasumi ( I pleaded with him, but he didn't budge) here is your blank canvas of 128 tiles.
Choose one of these screenshots to give a makeover to ( or find your own!). It can be a near 1:1 translation, or you can go nuts and do your own thing! That goes for placement, design, everything. As long as it fits the restrictions.
Here is an example I put together to get the ball rolling. Mine is perhaps a bit busy, so I challenge you to show me up! Note the extra tiles left over that could be used for stairs and other things further into the level.